| Adoption of Federal Constitution | Sept. 17 | |
| Allummapees, King of Delaware Indians | Aug. 12 | |
| American, John Penn, the | Jan. 29 | |
| Antes, Lt. Col. John Henry | May 13 | |
| Antes, Pious Henry | Jan. 12 | |
| Anti-Masonic Investigation | Dec. 4 | |
| Anti-Masonic Outbreak in Pennsylvania | Aug. 18 | |
| Anti-Masonic Period Terminates | Dec. 4 | |
| Armed Force to Forks of Ohio | Feb. 17 | |
| Armstrong, Captain John, Murdered | April 9 | |
| Armstrong Destroys Kittanning | Sept. 8 | |
| Arnold Arrested, General Benedict | Feb. 3 | |
| Asylum, the French Settlement | Dec. 20 | |
| Attempted Slaughter of Indians at Wichetunk | Oct. 12 | |
| Attempt to Navigate Susquehanna Fails | April 27 | |
| Baldwin, Matthias | Jan. 8 | |
| Bank, First in America | Dec. 31 | |
| Bank of North America | Jan. 7 | |
| Bard Family Captured by Indians | April 13 | |
| Bartram, John | March 23 | |
| Battle of Brandywine | Sept. 11 | |
| Battle of Bushy Run | Aug. 6 | |
| Battle of Fallen Timbers | Aug. 20 | |
| Battle of Germantown | Oct. 4 | |
| Battle of Gettysburg | July 1 and 2 | |
| Battle of the Kegs | Jan. 5 | |
| Battle of Lake Erie | Sept. 10 | |
| Battle of Minisinks | July 22 | |
| Battle of Monongahela | July 9 | |
| Battle of Muncy Hills | Aug. 26 | |
| Battle of Trenton | Dec. 26 | |
| Beatty, Rev. Charles, and Old Log College | Jan. 22 | |
| Bedford County Erected | March 9 | |
| Beissel, John Conrad | July 6 | |
| Bell for State House | June 2 | |
| Berks County Outrages | Nov. 14 | |
| Bethlehem as Base Hospital in Revolution | March 27 | |
| Bi-centennial | Oct. 21 | |
| Bills of Credit Put State on Paper Money Basis | March 2 | |
| Binns, John | Nov. 16 | |
| Binns, John | June 24 | |
| Binns, John, Fights Duel with Samuel Stewart | Dec. 14 | |
| Black Boys | Nov. 26 | |
| Bloody Saturday | Aug. 14 | |
| Bloody Election | Oct. 1 | |
| Boone, Daniel | Oct. 22 | |
| Border Troubles Reach Provincial Authorities | May 14 | |
| Border Troubles with Maryland | May 25 | |
| Border Troubles with Thomas Cresap | Nov. 23 | |
| Boundary Disputes Settled | Nov. 5 | |
| Boundary Dispute with Maryland | May 10 | |
| Boundary Dispute with Virginia | Sept. 23 | |
| Bounty for Indian Scalps | April 14 | |
| Bouquet Defeats Indians at Bushy Run | Aug. 6 | |
| Bouquet Relieves Fort Pitt | Aug. 10 | |
| Boyd, Captain John | Feb. 22 | |
| Boyd, Lieutenant Thomas Murdered | Sept. 13 | |
| Braddock’s Defeat | July 9 | |
| Braddock’s Road Begun | May 6 | |
| Braddock’s Troops Arrive | Feb. 20 | |
| Brady, Captain James, Killed | Aug. 8 | |
| Brady, Captain John | April 11 | |
| British and Indians Attack and Destroy Fort Freeland | July 28 | |
| British Destroy Indian Towns | Aug. 25 | |
| British Evacuate Philadelphia | June 17 | |
| British Invest Philadelphia | Sept. 26 | |
| Brodhead Arrives at Fort Pitt to Fight Indians | Mar. 5 | |
| Broadhead Destroys Coshocton | April 20 | |
| Brodhead Makes Indian Raid | Aug. 11 | |
| Brown, General Jacob | Feb. 24 | |
| Brulé, Etienne | Oct. 24 | |
| Buchanan, President James | April 23 | |
| Buck Shot War | Dec. 5 | |
| Bucks County Homes Headquarters for Washington and Staff | Dec. 8 | |
| Bull, Ole | Feb. 5 | |
| Bull, Gen John | June 1; Aug. 9 | |
| Cameron, Colonel James | July 21 | |
| Cameron Defeats Forney for Senate | Jan. 13 | |
| Cammerhoff, Bishop John Christopher | Jan. 6 | |
| Camp Curtin | April 18 | |
| Canal Lottery, Union | April 17 | |
| Canals Projected in Great Meeting | Oct. 20 | |
| Canal System Started | Feb. 19 | |
| Capitol, Burning of | Feb. 2 | |
| Capitol, New State | Jan. 2 | |
| Capital, Removed to Harrisburg | Feb. 21 | |
| Capture of Timothy Pickering | June 26 | |
| Carlisle Indian School | July 31 | |
| Carlisle Raided by Rebels | June 27 | |
| Carey, Matthew | Sept. 16 | |
| Chambers-Rieger Duel | May 11 | |
| Chambersburg Sacked and Burned by Rebels | July 30 | |
| Charter for City of Pittsburgh | Mar. 18 | |
| Charter for Pennsylvania Received by William Penn | Mar. 4 | |
| Chester County, Deed for | June 25 | |
| Church West of Alleghenies, First | June 20 | |
| Civil Government Established in Pennsylvania | Aug. 3 | |
| Clapham Builds Fort Halifax | June 7 | |
| Clapham Family Murdered by Indians | May 28 | |
| Clark Drafts Troops for Detroit Expedition | Mar. 3 | |
| Coal First Burned in a Grate | Feb. 11 | |
| Cochran, Dr. John | Sept. 1 | |
| Cooke & Co. Fail, Jay | Sept. 18 | |
| Cooper Shop and Union Saloon Restaurants | May 27 | |
| Commissioners Appointed to Purchase Indian Lands | Feb. 29 | |
| Conestoga Indians Killed by Paxtang Boys | Dec. 27 | |
| Confederate Raids into Pennsylvania | Oct. 10 | |
| Congress Threatened by Mob of Soldiers | June 21 | |
| Constitutional Convention of 1790 | Nov. 21 | |
| Constitution of 1790 | March 24; Sept. 2 | |
| Constitution of United States Adopted | Sept. 17 | |
| Continental Congress First Meets in Philadelphia | Sept. 5 | |
| Conway Cabal | Nov. 28 | |
| Cornerstones Laid for Germantown Academy | April 21 | |
| Council of Censors | Nov. 13 | |
| Cornwallis Defeats Americans at Brandywine | Sept. 11 | |
| Counties, First Division into | Feb. 1 | |
| Counties of Pennsylvania Organized | Mar. 10 | |
| Courts, Early Records | Jan. 11 | |
| Court Moved from Upland to Kingsesse | June 8 | |
| Cruel Murder of Colonel William Crawford | June 11 and 12 | |
| Crawford Burned at Stake by Indians | June 12 | |
| Crawford Captured by Indians, Colonel William | June 11 | |
| Cresap’s Invasion | Nov. 23 | |
| Croghan, George, King of Traders | May 7 | |
| Crooked Billet Massacre | May 1 | |
| Curtin Inaugurated Governor | Jan. 15 | |
| Darrah, Lydia | Dec. 11 | |
| Davy, the Lame Indian | May 30 | |
| Declaration of Independence | July 4 | |
| Deed for Chester County | June 25 | |
| Deed for Province Obtained by Penn | Aug. 31 | |
| Denny Succeeded by Governor Hamilton | Oct. 9 | |
| De Vries Arrives on Delaware | Dec. 6 | |
| Dickinson, John | Nov. 10 | |
| Disberry, Joseph, Thief | Nov. 22 | |
| Doan Brothers, Famous Outlaws | Sept. 24 | |
| Donation Lands | Mar. 12 | |
| Drake Brings in First Oil Well | Aug. 28 | |
| Duel, Binns-Stewart | Dec. 14 | |
| Duel in Which Capt. Stephen Chambers is Killed | May 11 | |
| Dutch Gain Control of Delaware | Sept. 25 | |
| Easton, Indian Conference at | Jan. 27; Aug. 7; Oct. 8 | |
| Education Established, Public School | Mar. 11 | |
| End of Indian War | Oct. 23 | |
| Ephrata Society | July 6 | |
| Era of Indian Traders | Aug. 12 | |
| Erie County Settled | Feb. 28 | |
| Erie Riots | Dec. 9 | |
| Erie Triangle | April 3 | |
| Etymology of Counties | Aug. 30 | |
| Europeans Explore Waters of Pennsylvania | Aug. 27 | |
| Ewell Leads Raid on Carlisle | June 27 | |
| Excise Laws, First | Mar. 17 | |
| Expedition Against Indians | Nov. 4; Nov. 8 | |
| Exploits of David Lewis, the Robber | March 25 and 26 | |
| Farmer’s Letters, Dickinson’s | Nov. 10 | |
| Federal Constitution Ratified by Pennsylvania | Dec. 12 | |
| Federal Party Broken Up | Nov. 29 | |
| Fell Successfully Burns Anthracite Coal | Feb. 11 | |
| Fires, Early, in Province | Dec. 7 | |
| First Bank in America | Dec. 31 | |
| First Bank in United States | Jan. 7 | |
| First Church in Province | Sept. 4 | |
| First Church West of Allegheny Mountains | June 20 | |
| First Continental Congress | Sept. 5 | |
| First Excise Laws | Mar. 17 | |
| First Fire Company in Province | Dec. 7 | |
| First Forty Settlers Arrive at Wyoming | Feb. 8 | |
| First Governor of Commonwealth | Dec. 21 | |
| First Jury Drawn in Province | Nov. 12 | |
| First Law to Educate Poor Children | Mar. 1 | |
| First Magazine in America | Feb. 13 | |
| First Massacre at Wyoming | Oct. 15 | |
| First Mint in United States | April 2 | |
| First Oil Well in America | Aug. 28 | |
| First Newspaper in Province | Dec. 22 | |
| First Newspaper West of Allegheny Mountains | July 29 | |
| First Northern Camp in Civil War | April 18 | |
| First Paper Mill in America | Feb. 18 | |
| First Permanent Settlement | Sept. 4 | |
| First Post Office | Nov. 27 | |
| First Protest Against Slavery | Feb. 12 | |
| First Settlement of Germantown | Oct. 6 | |
| First Theatrical Performances | April 15 | |
| First Troops to Reach Washington at Cambridge | July 25 | |
| First Union Officer Killed in Civil War | July 21 | |
| Flag, Story of | June 14 | |
| Flight of Tories from Fort Pitt | Mar. 28 | |
| Forbes Invests Fort Duquesne | Nov. 25 | |
| Forney Defeated for U. S. Senate by General Simon Cameron | Jan. 13 | |
| Forrest, Edwin | April 7 | |
| Forrest Home for Actors | April 7 | |
| Fort Augusta | Mar. 29 | |
| Fort Freeland Destroyed by British and Indians | July 28 | |
| Fort Granville Destroyed | Aug. 1 | |
| Fort Halifax | June 7 | |
| Fort Henry | Jan. 25 | |
| Fort Hunter | Jan. 9 | |
| Fort Laurens Attacked by Simon Girty | Feb. 23 | |
| Fort Mifflin Siege Begins | Sept. 27 | |
| Fort Montgomery | Sept. 6 | |
| Fort Patterson | Oct. 2 | |
| Fort Pitt First So Called | Nov. 25 | |
| Forts Built by Colonel Benjamin Franklin | Dec. 29 | |
| Fort Swatara | Oct. 30 | |
| Fort Wilson Attacked by Mob | Oct. 5 | |
| Frame of Government | April 25 | |
| Francis, Colonel Turbutt, Leads Troops to Wyoming | June 22 | |
| Franklin, Benjamin | Jan. 17 | |
| Franklin at Carlisle Conference | Sept. 22 | |
| Franklin at French Court | Dec. 28 | |
| Franklin Builds Chain of Forts | Dec. 29 | |
| Franklin County Erected | Sept. 9 | |
| Franklin Sails for England | Nov. 8 | |
| Free Society of Traders | May 29 | |
| French and Indians Destroy Fort Granville | Aug. 1 | |
| French and Indian War | May 5 | |
| French and Indian War Started | Feb. 20 | |
| French Defeat Major Grant at Fort Duquesne | Sept. 14 | |
| French Plant Leaden Plates | June 15 | |
| Frenchtown, or Asylum Founded by Refugees | Dec. 20 | |
| FrietchieFrietchie, Barbara | #Dec. 18:c1218⑲ | |
| Fries Rebellion | Mar. 14 | |
| Fulton, Robert | Aug. 17 | |
| Gallatin, Albert | Jan. 20 | |
| Galloway, Joseph | Aug. 29 | |
| Garrison at Fort Pitt Relieved by Colonel Henry Bouquet | Aug. 10 | |
| German Pietists Organize Harmony Society | Feb. 15 | |
| Germantown Academy | April 21 | |
| Gettysburg Address, Lincoln’s | Nov. 19 | |
| Gnadenhutten Destroyed | Nov. 24 | |
| Gnadenhutten (Ohio) Destroyed | Mar. 8 | |
| Gibson’s Lambs | July 16 | |
| Gilbert Family in Indian Captivity | Aug. 22 | |
| Girard, Captain Stephen | May 21 | |
| Girty Attacks Fort Laurens | Feb. 23 | |
| Girty, Simon, Outlaw and Renegade | Jan. 16 | |
| Gordon, Governor Patrick | Aug. 5 | |
| Grant Leaves Philadelphia on World Tour | Dec. 16 | |
| Grant Suffers Defeat at Fort Duquesne | Sept. 14 | |
| Great Runaway | July 5 | |
| Groshong’s, Massacre at Jacob | May 16 | |
| Hambright’s Expedition Against Great Island | Nov. 4 | |
| Hamilton, James, Becomes Governor | Oct. 9 | |
| Hand, General Edward | Sept. 3 | |
| Hand’s Expedition Moves from Fort Pitt | Oct. 19 | |
| Hannastown Burned | July 13 | |
| Hannastown Jail Stormed by Mob | Feb. 7 | |
| Harmony Society | Feb. 15 | |
| Harris, John | Oct. 25 | |
| Hartley’s Expedition Against Indians | Sept. 7 | |
| Hiester, Governor Joseph | Nov. 18 | |
| Hiokatoo, Chief | Nov. 20 | |
| Hospital at Bethlehem, Base | Mar. 27 | |
| Hot Water War | Mar. 14 | |
| Howe Moves Against Philadelphia | July 23 | |
| Impeachment, Supreme Court Judges Yeates, Smith and Shippen | Dec. 13 | |
| Inland Waterways Meeting | Oct. 20 | |
| Inquisition on Free Masonry a Fiasco | Dec. 19 | |
| Inauguration of Governor Curtin | Jan. 15 | |
| Inauguration, Governor Thomas Mifflin | Dec. 21 | |
| Inauguration of Governor Packer | Jan. 19 | |
| Indian Conference at Easton | Jan. 27; Aug. 7; Oct. 8 | |
| Indian Conference at Harris Ferry | April 1 | |
| Indian Conference at Philadelphia | June 30; Aug. 16 | |
| Indian Conference at Lancaster | Apr. 1 | |
| Indian School at Carlisle | July 31 | |
| Indian Shoots at Washington | Nov. 15 | |
| Indian Traders, Era of | Aug. 12 | |
| Indian War Ends | Oct. 23 | |
| Indians Capture Assemblyman James McKnight | April 26 | |
| Indians Commit Outrages in Berks County | Nov. 14 | |
| Indians Defeated at Fallen Timbers | Aug. 20 | |
| Indians Destroy Widow Smith’s Mill | July 8 | |
| Indians Kill Major John Lee and Family | Aug. 13 | |
| Indians Murder Colonel William Clapham and Family | May 28 | |
| Indians Ravage McDowell Mill | ||
| Settlement | Oct. 31 | |
| Indians Slaughtered at Gnadenhutten, Ohio | Mar. 8 | |
| Jail at Hannastown Stormed | Feb. 7 | |
| Jennison, Mary, Capture of | April 5 | |
| Johnstown Flood | May 31 | |
| Journey of Bishop Cammerhoff | Jan. 6 | |
| Judges Yeates, Shippin and Smith Impeached | Dec. 13 | |
| Kegs, Battle of the | Jan. 5 | |
| Keith, Sir William | Nov. 17 | |
| Kelly, Colonel John | April 8 | |
| Kittanning Destroyed by Colonel John Armstrong | Sept. 8 | |
| Know Nothing Party and Pollock | June 5 | |
| Labor Riots After Civil War | Sept. 18 | |
| Lacock, General Abner | April 12 | |
| Lafayette Retreats at Matson’s Ford | May 20 | |
| Leaning Tower, John Mason’s | April 22 | |
| Lee Family, Massacre of | Aug. 13 | |
| Lewis, David, The Robber | March 25 and 26 | |
| Lewistown Riot | Sept. 12 | |
| Liberty Bell Hung in State House | June 2 | |
| Lincoln’s Gettysburg Address | Nov. 19 | |
| Littlehales Murdered by Mollie Maguires | March 15 | |
| Lochry Musters Troops in Westmoreland County | Aug. 2 | |
| Locomotive, First Successful | Jan. 8 | |
| Logan, Hon. James | Oct. 28 | |
| Logan’s Family Slain, Chief | May 24 | |
| Log College, Old | Jan. 22 | |
| Lost Sister of Wyoming | Nov. 2 | |
| Lottery for Union Canal | April 17 | |
| Lower Counties in Turmoil | Nov. 1 | |
| Lumbermen’s War at Williamsport | July 10 | |
| Lycans, Andrew | Mar. 7 | |
| Maclay, Samuel | Jan. 4 | |
| Maclay, Hon. William | July 20 | |
| Magazine, First in America | Feb. 13 | |
| Major Murdered by Mollie Maguires | Nov. 3 | |
| Maguires, Mollie | Jan. 18; Feb. 1#; March 15; May 4; Aug. 14; Nov. 3; Dec. 2 | |
| Mason & Dixon Boundary Line | Dec. 30 | |
| Mason, John, and His Leaning Tower | April 22 | |
| Massacre Along Juniata River | Jan. 28 | |
| Massacre at Conococheague Valley | July 26 | |
| Massacre at Crooked Billet | May 1 | |
| Massacre at French Jacob Groshong’s | May 16 | |
| Massacre at Mahanoy Creek | Oct. 18 | |
| Massacre at Patterson’s Fort | Oct. 2 | |
| Massacre at Penn’s Creek | Oct. 16 | |
| Massacre at Standing Stone | June 19 | |
| Massacre at Williamsport | June 10 | |
| Massacre at Wyoming | July 3 | |
| Massacre of Americans at Paoli | Sept. 20 | |
| McAllister, Colonel Richard | Oct. 7 | |
| McDowell’s Mills, Outrages at | Oct. 31 | |
| McFarlane, Andrew | Feb. 25 | |
| McKee, Captain Thomas | Jan. 24 | |
| McKnight, James, Captured by Indians | April 26 | |
| Meschianza | May 18 | |
| Mexican War | Dec. 15 | |
| Mifflin, General Thomas | Jan. 21 | |
| Mifflin, General Thomas, Inaugurated Governor | Dec. 21 | |
| Military Laws Repealed | Mar. 20 | |
| Militia Organization | Jan. 23 | |
| Minisink Battle | July 22 | |
| Mint, First in United States | April 2 | |
| Minuit, Peter, Arrives | Mar. 30 | |
| Mob Attacks Court House at Lewistown | Sept. 12 | |
| Mob Attacks Home of James Wilson | Oct. 5 | |
| Mob Threatens Congress | June 21 | |
| Monmouth, Battle of | June 28 | |
| Montour, Madame | Sept. 15 | |
| Moravian Church Established when Mob Assails Pastor | July 27 | |
| Moravian Indian Mission at Wyalusing | May 23 | |
| Moravians Massacred at Gnadenhutten | Nov. 24 | |
| Moravians Visit Great Island | July 11 | |
| More, Dr. Nicholas | May 15 | |
| Morris, Robert | Jan. 31 | |
| Mother Northumberland, Old | Mar. 21 | |
| Mott, Lucretia | Jan. 3 | |
| Murder of Sanger and Uren by Mollie Maguires | Feb. 10 | |
| Mutiny in Pennsylvania Line | Jan. 1 | |
| Navy of Pennsylvania | May 8 | |
| Negro Boy Starts Race Riot in Philadelphia | July 12 | |
| Negro School at Nazareth Started by Whitefield | May 3 | |
| Neville, Captain John, Sent to Fort Pitt | July 17 | |
| News of Revolution Reaches Philadelphia | April 24 | |
| New Sweden, Governor Printz Arrives | Feb. 16 | |
| Northumberland County Erected | Mar. 21 | |
| Oil Discovered at Titusville | Aug. 28 | |
| Pack Trains Attacked at Fort Loudoun | Mar. 6 | |
| Paoli Massacre | Sept. 20 | |
| Paper Mill, First in America | Feb. 18 | |
| Paper Money Basis | Mar. 2 | |
| Pastorius and Germans Settle at Germantown | Oct. 6 | |
| Patent for Province Given Duke of York | June 29 | |
| Patriotic Women Feed Soldiers in Civil War | May 27 | |
| Pattison to Burning of Capitol | Feb. 2 | |
| Paxtang Boys Kill Conestoga Indians | Dec. 27 | |
| Pence, Peter | Mar. 22 | |
| Penn, John | Feb. 9 | |
| Penn (John) Succeeds Richard Penn as Governor | Feb. 4 | |
| Penn, John, “The American” | Jan. 29 | |
| Penn Lands in His Province | Oct. 29 | |
| Penn Obtains Deed for Province | Aug. 31 | |
| Penn Receives Charter for Pennsylvania | Mar. 4 | |
| Penn Sails for England | Nov. 1 | |
| Penn, William | Oct. 14 | |
| Penn’s Creek Massacre | Oct. 16 | |
| Penn’s First Wife, John | June 6 | |
| Penn’s Frame of Government | April 25 | |
| Penn’s Second Visit to Province | Dec. 1 | |
| Penn’s Trip Through Pennsylvania | April 6 | |
| Pennamites Driven from Wyoming | Aug. 15 | |
| Pennsylvania in Battle of Monmouth | June 28 | |
| Pennsylvania Line, Mutiny in | Jan. 1 | |
| Pennsylvania Navy in Revolution | May 8 | |
| Pennsylvanian Proposes Railway to Pacific | June 23 | |
| Pennsylvania Railroad Organized | Mar. 31 | |
| Pennsylvania Ratifies Federal Constitution | Dec. 12 | |
| Pennsylvania Reserve Corps | April 19 | |
| Perry Wins Victory on Lake Erie | Sept. 10 | |
| Philadelphia Evacuated by British | June 17 | |
| Philadelphia Invested by British | Sept. 26 | |
| Philadelphia Riots | July 7 | |
| Pickering, Colonel Timothy | June 26 | |
| Pitcher, Molly | Oct. 13 | |
| Pittsburgh Gazette | July 29 | |
| Pittsburgh Receives City Charter | Mar. 18 | |
| Pittsburgh Railroads Fight for Entrance | Jan. 14 | |
| Plot to Kidnap Governor Snyder | Nov. 9 | |
| Pluck, Colonel John, Parades | May 19 | |
| Plunket Defeated by Yankees | Dec. 25 | |
| Plunket Defeats Yankees | Sept. 28 | |
| Plunket’s Expedition Against Yankees | Dec. 24 | |
| Pollock and Know Nothing Party | June 5 | |
| Pontiac’s Conspiracy | May 17 | |
| Post, Christian Frederic | April 29 | |
| Post Office, Pioneer | Nov. 27 | |
| Powder Exploit, Gibson’s | July 16 | |
| Powell, Morgan, Murdered by Mollie Maguires | Dec. 2 | |
| Presqu’ Isle Destroyed by Indians | June 4 | |
| Preston, Margaret Junkin | Mar. 19 | |
| Priestley, Dr. Joseph | Feb. 6 | |
| Printz, Johan | Feb. 16 | |
| Provincial Conference | June 18 | |
| Provincial Convention | July 15 | |
| Provincial Troops March Against Wyoming Settlements | June 22 | |
| Public Education Established | Mar. 11 | |
| Purchase Caused Boundary Dispute | June 9 | |
| Quakers Protest vs. Slavery | Feb. 12 | |
| Quick, Tom | July 19 | |
| Race Riot in Philadelphia | July 12 | |
| Railroads Fight to Enter Pittsburgh | Jan. 14 | |
| Reading Railroad Organized | April 4 | |
| Rebels Raid on Carlisle | June 27 | |
| Rebels Sack and Burn Chambersburg | July 30 | |
| Records of Early Courts | Jan. 11 | |
| Reign of Mollie Maguire Terror Ended | Jan. 18 | |
| Riots at Philadelphia | July 7 | |
| Rittenhouse, William | Feb. 18 | |
| Ross, Betsy | Jan. 30 | |
| Ross, George | July 14 | |
| Ruffians Mob Pastor | July 27 | |
| Runaway, Great | July 5 | |
| Sailors Cause Bloody Election | Oct. 1 | |
| Saturday Evening Post | Aug. 4 | |
| Sawdust War | July 10 | |
| School Law, First | Mar. 1 | |
| Schoolmaster and Pupils Murdered by Indians | July 26 | |
| Second Constitution for State | Mar. 24 | |
| Settlers Massacred at Lycoming Creek | June 10 | |
| Settlers Slay Chief Logan’s Family | May 24 | |
| Shawnee Indians Murder Conestoga Indians | April 28 | |
| Shikellamy, Chief | Dec. 17 | |
| Sholes, Christopher L., Inventor of typewriter | Feb. 14 | |
| Siege at Fort Mifflin Opens | Sept. 27 | |
| Slate Roof House | Jan. 29 | |
| Slavery, Quakers Protest Against | Feb. 12 | |
| Slocum, Francis, Indian Captive | Nov. 2 | |
| Smith, Captain James | Nov. 26 | |
| Smith, Captain John | Sept. 29; July 24 | |
| Smith, Colonel Matthew | Mar. 13; [Oct. 10]. | |
| Smith’s Mill, Widow | July 8 | |
| Snyder Calls for Troops in War of 1812 | Aug. 24 | |
| Snyder Escapes Kidnapping | Nov. 9 | |
| Springettsbury Manor | June 16 | |
| Squaw Campaign | May 2 | |
| Stamp Act | Nov. 7 | |
| Steamboat, Robert Fulton’s | Aug. 17 | |
| Steamboat “Susquehanna” Explodes | April 27 | |
| Stevens, Inquiry About Free Masonry | Dec. 19 | |
| Story of “Singed Cat” | Aug. 4 | |
| Stump, Frederick | Jan. 10 | |
| Sullivan’s Expedition Against Six Nations | May 26 | |
| Sunbury & Erie Railroad | Oct. 17 | |
| Susquehanna Company | Feb. 8 | |
| Susquehanna Company Organized | July 18 | |
| Swedes Come to Delaware River | Mar. 30 | |
| Swedes Make First Permanent Settlement | Sept. 4 | |
| Tedyuskung Annoys Moravians at Bethlehem | Aug. 21 | |
| Tedyuskung at Easton Conference | Oct. 8 | |
| Tedyuskung Defends Himself at Easton Council | Aug. 7 | |
| Tedyuskung, King of Delaware Indians | April 16 | |
| Theatrical Performances, First | April 15 | |
| Thief Joseph Disberry | Nov. 22 | |
| Thompson’s Battalion of Riflemen, Colonel William | July 25 | |
| Threatened War with France | Nov. 11 | |
| Tories Flee from Fort Pitt | Mar. 28 | |
| Tories of Sinking Valley | April 10 | |
| Transit of Venus | June 3 | |
| Treaty of Albany | Oct. 26 | |
| Treaty Ratified by Congress, Wayne’s | Dec. 3 | |
| Trent, Captain William | Feb. 17 | |
| Trimble, James | Jan. 26 | |
| TulliallanTulliallan or Story of John Penn’s First Wife | June 6 | |
| Turmoil in Lower Counties | Nov. 1 | |
| Typewriter, Sholes Invents the | Feb. 14 | |
| Unholy Alliance with Indians | Sept. 21 | |
| Upland Changed to Chester | Oct. 29 | |
| Venus, Observation of Transit of | June 3 | |
| Veterans French and Indian War Organize | April 30 | |
| Vincent, Bishop John Heyl | May 9 | |
| Walking Purchase | Sept. 19 | |
| War of 1812 | Aug. 24 | |
| War of 1812 Begun | May 12 | |
| Washington and Whisky Insurrection | Sept. 30 | |
| Washington at Logstown | Nov. 30 | |
| Washington Leads Troops in Whisky Insurrections | Oct. 3 | |
| Washington Shot at by Indians | Nov. 15 | |
| Washington to Command Troops in War with France | Nov. 11 | |
| Washington Uses Bucks County Homes for Headquarters | Dec. 8 | |
| Washington, Lady Martha | May 22 | |
| Waters of State Explored by Europeans | Aug. 27 | |
| Watson, John Fanning | Dec. 23 | |
| Wayne Defeats Indians | Dec. 3 | |
| Wayne Defeats Indians at Fallen Timbers | Aug. 20 | |
| Weiser, Conrad | June 13 | |
| Westmoreland County Erected | Feb. 26 | |
| Whisky Insurrection in Pennsylvania | Sept. 30 | |
| Whitefield Starts Negro School at Nazareth | May 3 | |
| White Woman of Genesee | April 5 | |
| Wiconisco Valley Suffers Indian Attack | Mar. 7 | |
| Wilmot, David | Mar. 16 | |
| Wilson, Alexander, The Ornithologist | Aug. 23 | |
| Wilson’s Indian Mission | Oct. 27 | |
| Witchcraft in Pennsylvania | Feb. 27 | |
| Wolf, Governor George and Public Education | Mar. 11 | |
| Wyalusing Indian Mission | May 23 | |
| Wyoming, First Massacre | Oct. 15 | |
| Wyoming Massacre | July 3 | |
| Yankees Drive Pennamites from Wyoming | Aug. 15 | |
| Yankees Humiliatingly Defeat Colonel | ||
| Plunket | Dec. 25 | |
| Yellow Fever Scourges | Nov. 6 | |
| York County in Revolution | Aug. 19 | |
| York, Duke of | June 29 | |
| Yost Murdered by Mollie Maguires | May 4 | |
| Zinzindorf, Count Nicholas | Dec. 10 | |